EIGRP Questions

Note: If you are not sure about EIGRP, please read our EIGRP Tutorial.

Question 1

Explanation

Below is an example of the “show ip eigrp neighbors” output.

Let’s analyze these columns:

+ H: lists the neighbors in the order this router was learned
+ Address: the IP address of the neighbors
+ Interface: the interface of the local router on which this Hello packet was received
+ Hold (sec): the amount of time left before neighbor is considered in “down” status
+ Uptime: amount of time since the adjacency was established
+ SRTT (Smooth Round Trip Timer): the average time in milliseconds between the transmission of a packet to a neighbor and the receipt of an acknowledgement.
+ RTO (Retransmission Timeout): if a multicast has failed, then a unicast is sent to that particular router, the RTO is the time in milliseconds that the router waits for an acknowledgement of that unicast.
+ Queue count (Q Cnt): shows the number of queued EIGRP packets. It is usually 0.
+ Sequence Number (Seq Num): the sequence number of the last update EIGRP packet received. Each update message is given a sequence number, and the received ACK should have the same sequence number. The next update message to that neighbor will use Seq Num + 1.

In this question we have to check the RTO and Q cnt fields.

Question 2

Explanation

To configure EIGRP for IPv6 we must explicitly specify a router ID before it can start running. For example:

ipv6 router eigrp 1
eigrp router-id 2.2.2.2
no shutdown

Notice that EIGRP for IPv6 router-id must be an IPv4 address. EIGRP for IPv4 can automatically pick-up an IPv4 to use as its EIGRP router-id with this rule:
+ The highest IP address assigned to a loopback interface is selected as the router ID.
+ If there are not any loopback addresses configured, the highest IP address assigned to any other active interface is chosen as the router ID

EIGRPv3 also uses the AS number (for example: ipv6 eigrp 1 under interface mode).

Question 3

Explanation

The “show ipv6 eigrp neighbors” command displays the neighbors discovered by the EIGRPv6. Notice that the neighbors are displayed by their link-local addresses.

Question 4

Explanation

The goodbye message is a feature designed to improve EIGRP network convergence. The goodbye message is broadcast when an EIGRP routing process is shutdown to inform adjacent peers about the impending topology change. This feature allows supporting EIGRP peers to synchronize and recalculate neighbor relationships more efficiently than would occur if the peers discovered the topology change after the hold timer expired.

The following message is displayed by routers that run a supported release when a goodbye message is received:

Note: In this question we should understand “impending”, not “implementing” as there are no correct answers with “implementing” topology change.

Question 5

Explanation

With auto-summary feature is turned on, EIGRP will summary these networks to their classful networks automatically. For example:
+ 172.15.4.0 belongs to class B so it will be summarized to 172.15.0.0
+ 10.4.3.0 belongs to class A so it will be summarized to 10.0.0.0
+ 192.168.4.0 belongs to class C so it will be summarized to 192.168.4.0 (same)

Question 6

Explanation

Split horizon is used in distance vector routing protocols (like RIP, EIGRP) to prevent routing loops by prohibiting a router from advertising a route back to the interface from which it was learned.

Question 7

Explanation

EIGRP provides a mechanism to load balance over unequal cost paths (or called unequal cost load balancing) through the “variance” command. In other words, EIGRP will install all paths with metric < variance * best_metric into the local routing table, provided that it meets the feasibility condition (to prevent routing loop). The feasibility condition states that, the Advertised Distance (AD) of a route must be lower than the feasible distance of the current successor route.

Question 8

Explanation

EIGRP provides a mechanism to load balance over unequal cost paths (or called unequal cost load balancing) through the “variance” command. In other words, EIGRP will install all paths with metric < variance * best_metric into the local routing table, provided that it meets the feasibility condition (to prevent routing loop). The feasibility condition states that, the Advertised Distance (AD) of a route must be lower than the feasible distance of the current successor route.

Question 9

Explanation

From the routing table we learn that network 192.168.10.0/30 is learned via 2 equal-cost paths (192.168.10.9 &192.168.10.5) -> traffic to this network will be load-balancing.

As you can see, EIGRP for IPv6 can only be enabled under each interface -> A is correct.

Under EIGRP process there is a shutdown feature where you can turn on or off -> E is correct.

Question 11

Explanation

These networks will be summarized to the major networks of that class so:
+ 10.4.3.0 belongs to class A -> It will be summarized into 10.0.0.0
+ 172.16.4.0 belongs to class B -> It will be summarized into 172.16.0.0
+ 192.168.2.0 belongs to class C -> It will be summarized into 192.168.2.0 (not changed)

Question 12

Question 13

Question 14

Explanation

The command “ipv6 summary-address eigrp as-numberipv6-address [admin-distance]” can be used to configure a summary aggregate address for a specified interface. We can also configure the administrative distance of that summary aggregate address as well.

Note: The “ipv6 bandwidth-percent eigrp” command configures the percentage of bandwidth that may be used by EIGRP for IPv6 on an interface. By default, EIGRP packets consume a maximum of 50 percent of the link bandwidth.

EIGRP for IPv6 uses the minimum bandwidth on the path to a destination network and the total delay to compute routing metrics. You can use the metric weights command to adjust the default behavior of EIGRP for IPv6 routing and metric computations.

where are the questions..??? I am a premium account holder and still cant view information

kristventu

February 28th, 2017

check CCNA FAQs & Tips for all Questions

Konzen

March 3rd, 2017

pls navigate this page and you will see where they are. this is already spoon feeding guys don’t make a fool of yourself

wassa

June 15th, 2017

question 11

If R1 is configured as shown, which three addresses will be received by other routers that are running EIGRP on the network? (Choose three)
R1(config)#router eigrp 103
R1(config-router)#network 10.4.3.0
R1(config-router)#network 172.16.4.0
R1(config-router)#network 192.168.2.0
R1(config-router)#auto-summary
A. 172.16.4.0
B. 10.0.0.0
C. 172.16.0.0
D. 192.168.2.0
E. 192.168.0.0
F. 10.4.3.0

Answer: B C D

Explanation

These networks will be summarized to the major networks of that class so:
+ 10.4.3.0 belongs to class A -> It will be summarized into 10.0.0.0
+ 172.16.4.0 belongs to class B -> It will be summarized into 172.16.0.0
+ 192.168.2.0 belongs to class C -> It will be summarized into 192.168.2.0 (not changed)

but !!! class c is 192.168.0.0 isn’t it??

Kiks

June 20th, 2017

@9tut, I don’t understand Q11??? and I agree with Wassa..can you explain???

Becky

June 26th, 2017

Q2 – Shoulnt it be d

OSC

June 27th, 2017

@wassa & @Kiks
Clas C is a /24 then we use the entirely 24 bits 192.168.4.

Ven

July 7th, 2017

@osc 👍

Mr west

July 9th, 2017

hello I am taking my exam on Tuesdays…..what’s there to expect?

Mr west

July 9th, 2017

CCNA

Hmm

July 9th, 2017

@wassa , in the case of auto summary …
class A is a /8 — this bit unchanged
class B is a /16– this bit unchanged
class C is a /24– this bit unchanged

Hidelmar is absolutely correct. And so is Raptor. AND it also supports shutdown. Welcome to the craziness!

max

March 27th, 2018

please send me the latest dumps
max.sarmd (at ) gmail (dot) com

gaurav4u

May 3rd, 2018

@hidelmar@cthelite Q10, I guess is correct, because here we are dealing with EIGRP IPv6 and not IPV4. EIGRP on IPv4 is configured in global configuration mode, but not on interface.
EIGRP on IPv6 is also configured in global configuration mode but the difference here is that EIGRP IPv6 also requires to be set on an interface, whereas EIGRP IPv4 does not need any interface configuration.

CCNAtut

May 24th, 2018

@9tut Q 10- please rectify-
EIGRP is configured globally and enabled under an interface for IPv6

Option A is wrong as it says it is globally configured and not enabled under an interface.

Option B and E are correct. Please change to the answers.

9tut

May 24th, 2018

@CCNAtut: Q.10 answer A means we cannot enable EIGRP IPv6 with the “network …” command under EIGRP process so it is correct.

Muhammad bilal

July 3rd, 2018

how i do the lab of the questions i cannot understand :( that how i do it

Meathman

July 12th, 2018

Hello 9tut,
Question 5 above refers to the network addresses shown by the ‘ip route’ command after ‘auto-summary’. The three networks are summarised in accordance with Class A, Class B and Class C, with no change taking place for the 192.168.4.0 network.
The same question appears in the EIGRP Test. A person is asked to pick three answers. I picked the three as displayed above. When I finished the test I got an incorrect mark for the question. The explanation was that no change would take place for the /24 network. That is true but in terms of the ip route command, the /24 network will appear, along with the /8 and /16. In fact the same layout appears in Q11 above and the three networks are displayed, which would be correct.
The test-answer is wrong. Could it be rectified? It will cause confusion if not corrected.

Anonymous

August 13th, 2018

gj

Anonymous

September 23rd, 2018

is this question, “Question 5

What are the address that will show at the “show ip route” if we configure the above statements? (Choose three)
router eigrp 100
network 172.15.4.0
network 10.4.3.0
network 192.168.4.0
auto-summary

” because if the summarization is activated the subnets will be dismantled as follows:
192.168.4.0,
The correct thing is not that they are: 192.168.0.0. Since the summarization is active

Djoko

November 14th, 2018

his page. Please share the link to questions.

Djoko

November 14th, 2018

Only answers are displayed. Please share the link to questions.

cris

December 2nd, 2018

Can someone explain the question 13 is C?
I think we need first create a process ID, once it is created the system will take the router id from highest loopback ip address or highest ipv4 interface, if not available we need put it manually. I think the answer should be D, but if there is not I assume answer is C because we already create the process id and now need put the router id because there is not loopback or interface configured. The question need to be more clear.